Sharp R-350B Service Manual

R-820BKR-820BWIn the interest of user-safety the oven should be restored to its originalcondition and only parts identical to those specified should b

8R-820BKR-820BWROAST COOKING CONDITIONTouch the ROAST pad once. And then program desiredcooking time by touching the number pads. The ROASTpad is pre

9R-820BKR-820BWSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. MICROWAVE POWER LEVEL PAD PRESSED ONCE(100%).3. COOKING TIME PROGRAMMED.4. START PAD

10R-820BKR-820BWSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. GRILL PAD TOUCHED.3. NUMBER "2" PAD TOUCHED.4. COOKING TIME PROGRAMMED.5.

11R-820BKR-820BWFigure O-5 Oven Schematic-Roast cooking ConditionFigure O-4 Oven Schematic-Convection cooking Condition (Convection with preheat mode)

12R-820BKR-820BWDESCRIPTION AND FUNCTION OF COMPONENTSDOOR OPEN MECHANISMThe door is opened by pushing the open button on thecontrol panel, refer to F

13R-820BKR-820BWTROUBLESHOOTING GUIDENever touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.Whe

14R-820BKR-820BWCK = Check / RE = ReplaceABCDEEFFGH I I JLMNNNNNNOPRERERERERECK CK CKTEST PROCEDUREMAGNETRONPOWER TRANSFORMERH.V. RECTIFIER ASSEMBLYHI

15R-820BKR-820BWB POWER TRANSFORMER TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharg

16R-820BKR-820BWTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block

17R-820BKR-820BWTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block

R-820BKR-820BWPRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLEEXPOSURE TO EXCESSIVE MICROWAVEENERGY(a) Do not operate or allow

18R-820BKR-820BWH BLOWN MONITOR FUSE TESTTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2

19R-820BKR-820BWThe following test procedure should be carried out with the microwave oven is a fully assembledcondition (outer case fitted).It is dif

20R-820BKR-820BWTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTM KEY UNIT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the

21R-820BKR-820BWTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTIf the control unit responds by clearing with a beep the key unit is faulty and must be re

22R-820BKR-820BWTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTWARNING : The oven should be fully assembled before following procedure.(1) Place one cup

23R-820BKR-820BWTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTSTEPS OCCURRENCE CAUSE OR CORRECTIONThe rated AC voltage is not present between1 Pin No. 1

24R-820BKR-820BWTOUCH CONTROL PANEL ASSEMBLYOUTLINE OF TOUCH CONTROL PANEL4) ACLA circuit to generate a signal which resets the LSI to theinitial stat

25R-820BKR-820BWDESCRIPTION OF LSILSI(IZA888DR)The I/O signal of the LSI(IZA888DR) are detailed in the following table.Pin No. Signal I/O DescriptionA

26R-820BKR-820BWPin No. Signal I/O DescriptionVARI ON TIME OFF TIMEP-HI(100% power) 32 sec. 0 sec.P-90(approx. 90% power) 30 sec. 2 sec.P-80(approx. 8

27R-820BKR-820BWPin No. Signal I/O DescriptionPower output ON time OFF time100 % 48 sec. 0 sec.90 % 44 sec. 4 sec.80 % 40 sec. 8 sec.70 % 36 sec. 12 s

1R-820BKR-820BWWARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of pro-ducing very high voltage and current, contact withfollowin

28R-820BKR-820BWPin No. Signal I/O Description81 SEG9 OUT Segment data signal.Connected to LCD. No connection in LCD.82-90 SEG8-SEG0 OUT Segment data

29R-820BKR-820BW1. Precautions for Handling Electronic ComponentsThis unit uses CMOS LSI in the integral part of the circuits.When handling these part

30R-820BKR-820BWTo remove the outer case, proceed as follows.1. Disconnect the power supply cord.2. Open the oven door and block it open.3. Remove the

31R-820BKR-820BWPOWER TRANSFORMER REMOVAL6. Disconnect the main wire harness from the powertransformer.7. Remove the two (2) screws holding the trans

32R-820BKR-820BWPOSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVALFigure C-2. Positive lock® connector1. Disconnect the power supply cord and then remo

33R-820BKR-820BWCOOLING FAN MOTOR REMOVALREMOVAL1.Disconnect the power supply cord and then remove outercase.2. Open the door and block it open.3. Dis

34R-820BKR-820BWDOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL1. Disconnect the power supply cord and then removeouter case

35R-820BKR-820BWREMOVAL1. Disconnect the power supply cord.2. Push the open button and open the door slightly.3. Insert a putty knife (thickness of ab

36R-820BKR-820BW7. Release two (2) pins of door panel from two (2) holes ofupper and lower oven hinges by lifting up.8. Now, door sub assembly is free

2R-820BKR-820BWMICROWAVE MEASUREMENT PROCEDUREA. Requirements:1) Microwave leakage limit (Power density limit): The power density of microwave radiati

38R-820BKR-820BW645123645123ABCDEFGHABCDEFGHFigure S-2. Power Unit Circuit+–+–+–COMN.O.COMN.O.COMN.O.COMN.O.A 3OVEN LAMPTURNTABLEMOTORBOTTOMHEATE

39R-820BKR-820BW645123645123ABCDEFGHABCDEFGHFigure S-3. CPU Unit CircuitC 4INTGNDVCBUZZER: IF NOT SPECIFIED, 1/10 ± 5% NOTEVALEDVRFANMOTORCONVECTIO

40R-820BKR-820BW645123645123ABCDEFGHABCDEFGHFigure S-4. Printed Wiring Board of Power UnitDIPD8 3 2 312 1115184 D6 R4 CN - C CN - D CN - B CN - A D5 R

41R-820BKR-820BW****∆*∆*PARTS LISTNote: The parts marked “∆” may cause undue microwave exposure.The parts marked “*” are used in voltage more than 250

42R-820BKR-820BW∆∆∆∆∆∆*REF. NO. PART NO. DESCRIPTION Q'TY CODE3- 4 LHLD-A185WRF0 LCD holder 1 AL3- 5 PSHEPA626WRE0 LED sheet 1 AF3- 6 TCAUAA076WR

43R-820BKR-820BWHOW TO ORDER REPLACEMENT PARTSTo have your order filled promptly and correctly, please furnish the following information.1. MODEL NUMB

44R-820BKR-820BW645123645123ABCDEFGHABCDEFGHOVEN AND CABINET PARTS7-97-94-47-97-197-197-54-14-307-107-107-112-16-27-111-107-154-254-334-297-107-124-

45R-820BKR-820BW645123645123ABCDEFGHABCDEFGHCONTROL PANEL PARTSDOOR PARTS5-85-35-65-45-55-15-93-63-25-75-26-16-86-106-76-93-3-13-3-33-3-23-33-43-53-1

46R-820BKR-820BW'98 SHARP CORP. (5S2.530E) Printed in U.S.ACOPYRIGHT © 1998 BY SHARP CORPORATIONALL RIGHTS RESERVED.No part of this publication m

3R-820BKR-820BWSHARP ELECTRONICS CORPORATIONSHARP PLAZA, MAHWAH,NEW JERSEY 07430-2135SERVICE MANUALDOUBLE GRILLCONVECTIONMICROWAVE OVENR-820BK / R-820

4R-820BKR-820BWITEM DESCRIPTIONPower Requirements 120 Volts12.5 Amperes (Microwave) / 13.0 Amperes (Grill/ Convection)60 Hertz / Single phase, 3 wire

5R-820BKR-820BWA short power-supply cord is provided to reduce risks of becomingentangled in or tripping over a longer cord.Where a two-pronged wall-

6R-820BKR-820BWOPERATIONDESCRIPTION OF OPERATING SEQUENCEThe following is a description of component functions duringoven operation.OFF CONDITIONClosi

7R-820BKR-820BWTOP AND BOTTOM HEATER MODEIn this mode, the food is cooked by both the top heaters andbottom heater. Press the GRILL pad and number &qu